I'm not sure yet. It says Antonius Stradivarius Cremonensis on the inside. This raises more questions than it answers. It's obviously very old, and it's provenance has been in quiet storage in one of the richest neighborhoods of Southern California. In the same boxes are other objects signed "Tiffany" etc. I'm curious too, to say the least. Stay tuned for other photos of delightful objects that will appear in this folder shortly.